Program ProbDisRuc;
type natural = word;
tab = array[natural] of natural;
var we,p,b:tab;
i,j,n,w,s:natural;
f,g:text;
begin
assign(f,'rucsac.in');
assign(g,'rucsac.out');
reset(f);
rewrite(g);
readln({f,}n,w);
for i:=1 to n do
 readln(f,we[i],p[i]);
for i:=1 to n do begin
 for j:=w downto we[i] do
  if b[j]<b[j-we[i]]+p[i] then begin
    b[j]:=b[j-we[i]]+p[i];
   end;
{ for j:=1 to w do
  write(b[j],' ');
 writeln;}
end;
writeln(g,b[w]);
close(f);
close(g);
end.